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Trying to update and failed

Hello All
I am trying to update with update manager. I get the following message.
Failed to download packages files. Check your internet connection. I check the internet connection and it is fine, I am doing other things and I'm not having a problem.
When I click the details button i get the following

I'm running Ubuntu 12.04 on a Lenovo B560.
I haven't had this problem before. I also have not had any problems downloading any updates for chrome in the past.
I did uncheck Mediubuntu, in the past I've done this and there was no problem.
Thank you in advance for any help you can give me with this problem.
Lou